反应详情

Toluene (10 mL) was added to the residue (1.02 g) obtained by concentration under reduced pressure. The mixture was cooled on an ice-bath, to which was added, while stirring, 2% hydrochloric acid (10 mL). The reaction mixture was stirred for 30 minutes, which was concentrated under reduced pressure to leave the residue (1.21 g). The concentrate was dissolved in methanol (5 mL), to which was added acetone (10 mL). The mixture was cooled to 0° C., which was then subjected to filtration to collect the title compound (0.64 g). Further, the filtrate was concentrated under reduced pressure. The concentrate (0.34 g) was recrystallized from a mixture of methanol (1.5 mL) and acetone (3.0 mL) to give the title compound (0.17 g, total yield 0.81 g, yield 68%). This hydrochloride was processed with a 5% aqueous solution of sodium hydroxide to give (S)-2-(1,6,7,8-tetrahydro-2H-indeno[5,4-b]furan-8-yl)ethylamine. The optical purity of the product was determined by means of high performance liquid chromatography, which was 100%e.e.